Code Review Bench PR #14725 - refactor(cli): disable jsonschema resolving external resources

[tomerqodo]

Code Review Bench PR tauri-apps#14725

Original PR Title: refactor(cli): disable jsonschema resolving external resources
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We only ever use it on the bundled schema for tauri.conf.json and it doesn't have any external resources that needs to be resolved, this removed the dependency on reqwest

Also moved this to be a OnceCell as it should never change
Original PR URL: tauri-apps#14725